Hoisting-machine



(N0 Medal.)

B. WATSON.

- HOISTING MACHINE.

{Yo/356,807. Patented Feb. 1, 1887,

1 7 m a m m n J 1 id m "wb 'i isses fir/Ma lhvrrnn S'rn'rns Arum? @rrrcnBENJAMIN IVATSON, OF WILMINGTON, DELAW'ARE.

HOlSTING MACHlNE.

BPBCIPICATION forming part of Letters Patent No. 356,807., datedFebruary 1, 1887.

Application filed September 14, 1886. Serial No. 213,475. (No model.)

To all whom it may concern:

Be it known that I, BENJAMIN Larson, a.- citizen of the United States,residing at Vilmingtomin the county of New Castle and State of Delaware,have invented certain new and useful Improvements in Hoisting-Machines;and I do declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same, reference. beinghad to the accompanying drawings, and to the letters and figures ofreference marked thereon, which form a part of this specification.

This hoisting machine is intended more particularly for the hoisting orlifting of heavy weights; and it consists in the combination of gearingwhich does this with small expenditure of power and with even anduniform strain.

The improved machine is illustrated in the accompanying drawings, inwhich Figure l is a perspective view of the machine. Fig. 2 is at topview, and Fig. 8 is a. horizontal section taken just above the drivewheel and looking down.

The frame-work of the machine consists of an elevated platform, A,supported by posts or legs B B, the latter being suitably braced andcarried on casters a. c. Surrounding the supporting-lcgshelow theplatform,aud resting upon anti-friction rollers Z11), mounted insuitable hearings in the frame-work, is the drivewheel C. Thisdrive-wheel is a. circular rim having rack -teeth on its innerperiphery. This wheel may be rotated by any convenient mechanism,provision being shown at c for attaching an operating-lever thereto.Rotatively mounted on the opposite sides of the frame-work are twovertical shafts, I) D, each of which carries on its lower end a smallpinion, E, meshing with the drive-wheel, and on its upper end above theplatform a. large cogwheel, Upon the center of the platform A isrotatively mounted a shaft, which on its upper end carries a cog wheel,G, which meshes with the two cog-wheels F F. ()n the some shaft with thewheel G is a second cogwheel, H. This wheel H rotates just above thesurface of the platform, and it meshes with four other cog-wheels, I l,which rotate in the same horizontal plane therewith. The threecog-wheels F F Gare of substantially the same size, and the five wheelsH H I, smaller than them, are equal in size to each other. Each of thewheels I I has a central screw-threaded aperture, through which passes avertical exteriorly screw threaded rod, J. The four rods J J extendbeneath the platform, and to their lower ends is seen red a rectangularframe, K. Upon this frame are placed, or to it are secured, the weightsto be raised or lowered. The rotation of the drive-wheehecting throughthe intermediate gearing, raises or lowers the screw-rods and the weightcarried thereby. By the employment of a large drive-wheel inclosing theother parts of the machine a large leverage is obtained, and by theemployment of the double and quadruple gearing the mo tion is rendereduniform and steady.

W'ith the exception of the supporting-legs and the lifting-frame K,which are preferably wood, all of the parts are preferably made ofmetal. The machines are usually constructed from ten to twelve feet inheight, and the drive-wheel located at about the vertical center. Amongthe purposes for which this machine may be used may be mentioned raisingbuildings and extracting stumps.

I claim as my invention- In'ahoisting-machine,the supporting framework,the rotatively-mounted drive-wheel O, composed of a circular rim havingrack-teeth on its inner periphery, said wheel surrounding the'supportingframe-work, and the vertical shaft-s l), having piuions E E on theirlower ends, meshing with the drivewheel, and cog-wheels F F on theirupper ends, in combination with the cog-wheel G, meshing with the wheelsF F, the cogwh eel H on the same shaft with the wheel G, the cog-wheelsI I, meshing with the wheel H, said wheels I I having centralscrew-threaded apertures, and the vertical exteriorly screwthreeded rodsJ J, extending through the apertures in said wheels I I, substantiallyas set forth.

In testimony whereof I aiiix my signature in presence of two witnesses.

BENJAMIN 2 whrsoiv.

mark. \Vitnesses:

Gno. XV. BRIGHT, HENRY O. CONRAD.

